ASME SA179 is a standard for seamless steel pipe for heat exchanger formulated by the American Society of Mechanical Engineers (ASME), which specifies key indicators such as the manufacturing process, chemical composition, mechanical properties and dimensional tolerance of the pipe. This standard ensures that the steel pipe has excellent pressure resistance, thermal conductivity and corrosion resistance in various heat exchangers, and is suitable for harsh working conditions in chemical, power, food and other industries.
Core advantages of cold drawing process
American standard cold drawn seamless pipe adopts room temperature drawing technology and is precisely formed by molds. It has the following characteristics:
High-precision size: strict outer diameter tolerance (such as ±0.10mm), uniform wall thickness, suitable for high-sealing heat exchanger structure.
Strengthening mechanical properties: cold deformation makes the grains oriented, improves tensile strength (≥325MPa) and hardness, while maintaining good toughness.
Excellent surface quality: smooth inner wall (roughness Ra≤0.8μm), reduces fluid resistance, and optimizes heat exchange efficiency.
Key size specifications
ASME SA179 covers a variety of specifications to meet the needs of different heat exchange scenarios:
Outer diameter range (mm) Wall thickness range (mm) Typical application scenarios
12.7~25.4 1.24~2.11 Compact plate heat exchanger
25.4~38.1 2.11~3.81 Chemical shell and tube heat exchanger
38.1~50.8 3.81~5.59 Power station high-pressure condenser
Industry application cases
1. Chemical industry
Petroleum refining: Heat exchange tube bundles used in hydrogenation reactors, resistant to hydrogen sulfide corrosion (H₂S concentration ≤50ppm).
Sulfuric acid production: Cooling high-temperature SO₂ gas (≤450℃), anti-corrosion coating is required when using carbon steel.
2. Electric power
Condenser pipes: In thermal power plants, SA179 steel pipes withstand 0.1MPa steam pressure, with a thermal conductivity of 50W/(m·K), and a condensation efficiency increase of 15%.